NOTE: From article: “To simulate reduced gravity, we used two different apparatuses: a vertical body weight unloading system and a tilting body weight unloading system.” They were used in various configurations.

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Chaudhuri SE, Karmali F, Merfeld DM.

Whole-body motion-detection tasks can yield much lower thresholds than direction-recognition tasks: Implications for the role of vibration.

NOTE: From abstract: “These results suggest that humans possess an inborn predisposition about the direction of the gravity force that imprints biological motion and supports the hypothesis that a mechanism for the detection of biological motion is already at work before visual experience.”